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llvm-project/llvm/test/CodeGen/Thumb/constants.ll

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[Thumb-1] Add optimized constant materialization for integers [256..512) We can materialize these integers using a MOV; ADDi8 pair. llvm-svn: 272007
2016-06-07 21:10:14 +08:00
; RUN: llc < %s -mtriple=thumbv7-linux-gnueabi -mcpu=cortex-m0 -verify-machineinstrs | FileCheck --check-prefix CHECK-T1 %s
; RUN: llc < %s -mtriple=thumbv7-linux-gnueabi -mcpu=cortex-m3 -verify-machineinstrs | FileCheck --check-prefix CHECK-T2 %s
; CHECK-T1-LABEL: @mov_and_add
; CHECK-T2-LABEL: @mov_and_add
; CHECK-T1: movs r0, #255
; CHECK-T1: adds r0, #12
; CHECK-T2: movw r0, #267
define i32 @mov_and_add() {
ret i32 267
}
[Thumb] Fix off-by-one error in r272007 We can only generate immediates up to #510 with a MOV+ADD, not #511, because there's no such instruction as add #256. Found by Oliver Stannard and csmith! llvm-svn: 272665
2016-06-14 21:33:07 +08:00
; CHECK-T1-LABEL: @mov_and_add2
; CHECK-T2-LABEL: @mov_and_add2
; CHECK-T1: ldr r0,
; CHECK-T2: movw r0, #511
define i32 @mov_and_add2() {
ret i32 511
}
[ARM] Materialise some boolean values to avoid a branch This patch combines some cases of ARMISD::CMOV for integers that arise in comparisons of the form a != b ? x : 0 a == b ? 0 : x and that currently (e.g. in Thumb1) are emitted as branches. Differential Revision: https://reviews.llvm.org/D34515 llvm-svn: 325323
2018-02-16 17:23:59 +08:00
; CHECK-T1-LABEL: @test64
; CHECK-T2-LABEL: @test64
; CHECK-T1: movs r4, #0
; CHECK-T1: mvns r5, r4
; CHECK-T1: mov r0, r5
; CHECK-T1: subs r0, #15
; CHECK-T2: subs.w r0, r{{[0-9]+}}, #15
; CHECK-T2-NEXT: sbc r1, r{{[0-9]+}}, #0
define i32 @test64() {
entry:
tail call void @fn1(i64 -1)
tail call void @fn1(i64 -1)
tail call void @fn1(i64 -16)
ret i32 0
}
declare void @fn1(i64) ;